>Until we figure out how to produce only female calves.

We have figured it out. We can sort sperm into X- and Y-sperm with a reliability >90%. It's actively being used in dairy production. However, the female calves are still usually slaughtered as there's no demand for an exponentially growing number of dairy cows; as far as I could gather, the benefit for a dairy production is mainly in that birthing a male calf is more dangerous for the cow.